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pkg/order/mailersend.go

@@ -0,0 +1,84 @@
+package order
+
+import (
+	"context"
+	"fmt"
+	"net/mail"
+	"strings"
+
+	"github.com/mailersend/mailersend-go"
+)
+
+// MailerSendEmailSender sends email through the MailerSend API using the
+// official Go SDK. It implements the EmailSender interface.
+type MailerSendEmailSender struct {
+	client      *mailersend.Mailersend
+	defaultFrom mail.Address
+}
+
+// NewMailerSendEmailSender creates a new MailerSend-backed sender.
+func NewMailerSendEmailSender(apiKey string, defaultFrom mail.Address) (*MailerSendEmailSender, error) {
+	if strings.TrimSpace(apiKey) == "" {
+		return nil, fmt.Errorf("mailersend sender: missing API key")
+	}
+	if strings.TrimSpace(defaultFrom.Address) == "" {
+		return nil, fmt.Errorf("mailersend sender: missing default from address")
+	}
+	return &MailerSendEmailSender{
+		client:      mailersend.NewMailersend(apiKey),
+		defaultFrom: defaultFrom,
+	}, nil
+}
+
+// DefaultFrom returns the default sender address configured for this sender.
+func (s *MailerSendEmailSender) DefaultFrom() mail.Address { return s.defaultFrom }
+
+// Send delivers the rendered email message through the MailerSend API.
+func (s *MailerSendEmailSender) Send(ctx context.Context, msg EmailMessage) error {
+	if strings.TrimSpace(msg.From.Address) == "" {
+		return fmt.Errorf("mailersend sender: missing from address")
+	}
+	if len(msg.To) == 0 {
+		return fmt.Errorf("mailersend sender: missing recipients")
+	}
+	if strings.TrimSpace(msg.Subject) == "" {
+		return fmt.Errorf("mailersend sender: missing subject")
+	}
+	if strings.TrimSpace(msg.TextBody) == "" && strings.TrimSpace(msg.HTMLBody) == "" {
+		return fmt.Errorf("mailersend sender: missing body")
+	}
+
+	message := s.client.Email.NewMessage()
+
+	fromName := msg.From.Name
+	if fromName == "" {
+		fromName = s.defaultFrom.Name
+	}
+	message.SetFrom(mailersend.From{
+		Name:  fromName,
+		Email: msg.From.Address,
+	})
+
+	recipients := make([]mailersend.Recipient, 0, len(msg.To))
+	for _, rcpt := range msg.To {
+		recipients = append(recipients, mailersend.Recipient{
+			Name:  rcpt.Name,
+			Email: rcpt.Address,
+		})
+	}
+	message.SetRecipients(recipients)
+	message.SetSubject(msg.Subject)
+
+	if strings.TrimSpace(msg.HTMLBody) != "" {
+		message.SetHTML(msg.HTMLBody)
+	}
+	if strings.TrimSpace(msg.TextBody) != "" {
+		message.SetText(msg.TextBody)
+	}
+
+	_, err := s.client.Email.Send(ctx, message)
+	if err != nil {
+		return fmt.Errorf("mailersend sender: %w", err)
+	}
+	return nil
+}